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• The same techniques used Co sample vegetation on [he affected area <br />were employed to adequately sample cover on the potential reference area. <br />Equivalency of cover and production on the pi:ryon-junlper reference and <br />affected areas vas tested with a t-test comparison (Larson 1960) of the <br />cover and productLon values as follows: <br />Ho: reference area j ~ affected area 1 <br />Ha: reference area j ~ affected area 1 <br />Xj Xi <br />to - <br />~nj + n <br />sp \,njni i, <br />where: to ~ estimated t-value which is canpared to tabulac <br />t-value ' <br />x - mean <br />s2 ~ variance <br />n ~ sample size <br />• i i affected area data <br />j reference area data <br />mi+mi <br />s ~ nj + ni - 2 <br />m ~ (n-1) sz <br />The location of the chosen reference area is shown on the vegetation <br />map (Hap 1). The corners of the reference area were permanently marked <br />with steel rods. <br />2.3 VEGETATION DOVER SAMPLING <br />Vegetation cover vas sampled on the affected area using the, point <br />intercept method and 10 pin frame (Hueller-Dombois~and Ellenbert 1974). <br />Each cover [ranseet consisted of a total of 100 points along a 50 m tran- <br />sact located at each randomly chosen sample point. The direction of Che <br />cover transect vac determined by a randomly selected compass bearing. The <br />. 10 pin frame vas read at ten randomly selected points along the 50 m tran- <br />sect for a total of 100 points. <br />